ASHTON Anthony — Harmonograph, a Visual Introduction to Harmony
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Wooden Books near fine copy in same DW, minor spots of discolouration to spine edge of DW, 58 pp, the mechanics behind the Harmonograph, a Victorian invention that records sound waves as pencilled lines on paper, H First Edition Very Good Powys Very Good Anthony Ashton 16mo - over 5? - 6? tall
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$20.00 (€18.15 | £15.14 | ¥3,194)